Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bcdec04e92b927…

MALICIOUS

PDF

48.4 KB Created: 2020-07-31 15:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 0d45802735c00a52f67b8f2f4d607bfc SHA-1: ed56e151580e47cf282e64c5b2c7f9bf441bc5fd SHA-256: 81bcdec04e92b927f88f7b45870ba9148a0e14907625667d75c20fab26e96dce
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically linking to a URL that appears to be an SEO spam redirector. The document body, though heavily obfuscated, suggests a lure related to a "Unix command cheat sheet". The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=unix+command+cheat+sheet In PDF document text
    • http://files.celebrationcatering.net/uploads/1/3/1/1/131163736/kutenuzagibaselu.pdfIn PDF document text
    • http://files.coupevillelions.org/uploads/1/3/2/6/132682281/8316978.pdfIn PDF document text
    • http://files.dominickmscialabba.com/uploads/1/3/0/9/130969993/sebafep-widemej.pdfIn PDF document text
    • http://files.morethansoulfood.com/uploads/1/3/0/7/130738876/vidorot.pdfIn PDF document text
    • http://files.murphymedicalwriting.com/uploads/1/3/0/8/130873838/fevewili-rumujez-batex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6898/7294/files/auto_tunes_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/41546765921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85484739365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/surilodimibid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/nazepito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/kiwafumugufesawave.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/vumenekukikosugebiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/mexowunasorizezesow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/55764788095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/77992231083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/pelurobuzubujag.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1A 4896 bytes
SHA-256: 578db8cda080355194070620aec6271ef0d313ae37b1a0c9a8758a250f0c732c
font_01_sfnt_off00008f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F8D 10996 bytes
SHA-256: d4cf0419d5c17222e6aed662dc424d1d794dedd92a06b0521f904daeb82c0d18

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